I personally use and love shadow protect. While not a pure image program, I like it better. It allows for restores to dissimilar drives, RAID levels, and/or controllers.
For example, if your 850 Pro died (highly unlikely ), you could restore your image to a 2TB SATA drive and then image the 2tb and restore back to the smaller SSD after a RMA replacement is received.
Thx for the hint. Just read though it. What I want is image backup, easily to restore on my ssd.